Last Uploaded: January, 2010

Sakai Gas Building

Architectural DataFeaturesCasbee ScoreTechnical Details建物リストに戻る
Conceptual diagram of a hybrid air conditioning system using natural ventilation and ceiling fans
Conceptual diagram of a hybrid air conditioning system using natural ventilation and ceiling fans Office floor with ceiling fans Conceptual cross section of the building Cross sectional drawing of a staircase for the natural ventilation route
Floor planning for the natural ventilation route Flow diagram for controlling the hybrid air conditioning system using natural ventilation and ceiling fans Installation diagram of a ceiling fan Photograph of a ceiling fan
Conceptualization of air conditioning in this building (at 28 °C) Conceptualization of general ceiling diffusion air conditioning (at 26 °C） Flow diagram of a heat source system Overview of the use of exhaust heat for a cascade
Pair-zone air conditioning system on standard floors Outside air treatment system with total enthalpy heat exchanger and desiccant air conditioning system Conveyance power reduction by piping antifriction agents Natural daylight from core slit

Special Features

Q-1 Indoor Environment
  • PMV sensors are installed to enable temperature control within a comfortable temperature range.
  • The natural air intake chamber is provided with the means to prevent external noise from entering.
  • The air conditioning zone is divided according to direction, interior, and perimeter.
  • Environmental adjustment mechanisms by the ceiling fans that are individually controllable.
  • The common use space which allows sufficient natural light in by segmenting the core.
Q-2 Quality of Service
  • Reliability is improved by micro gas turbine cogeneration.
  • OA floor: 200 mmH
  • Power supply capacity: 50 VA/m2
  • Ceiling height: 2.8 m
  • Story height: 4.3 m
  • High earthquake resistance
  • A dual structure is used for the power supplies and heat sources for important equipment.
  • Use of rainwater
  • Dedicated EPS for telecommunications
  • Vending machine space is provided for refreshment for nonsmokers in addition to a separate space for smoking.
Q-3 Outdoor Environment on Site
  • Matching with urban axes, vertical faces reflecting the sky, greening of the site, and the construction and maintenance of a small parks.
  • Greening of the exterior and the roof, water-permeable pavement, heat exhaust units concentrated on the roof
  • Greening of the exterior and the roof was actively promoted to maintain the environment around the site.
LR-1 Energy
  • As a cooling function, ceiling fans are used to extend natural ventilation time.
  • As a cooling function, ceiling fans are used to achieve comfortable air conditioning at 28°C in summer.
  • Natural ventilation-based hybrid air conditioning, night purge, and daylight usage control are adopted.
  • Various energy-saving systems are used for air conditioning, ventilation, lighting, and elevators.
  • A BEMS is used to perform in-depth monitoring by system and by unit.
  • Monitoring data is used to conduct commissioning at the operation stage.
LR-2 Resources and Materials
  • Rainwater is used as water for miscellaneous use.
  • A water-saving plunger and toilets are utilized.
  • Pavement bricks made from sewage sludge and an OA floor using waste glass and blocks are adopted.
  • Building frames and finishing materials are easy to separate, and so are interior materials and equipment.
  • An absorption type chiller heater is used as the main heat source with ODP planned to be 0.
  • Heat exhausted from the CGS is used for desiccant air conditioning systems, exhaust heat recovery/absorption type chiller heaters, heating systems, and hot water supply systems.
LR-3 Off-site Environment
  • The main units are low noise models and are installed on the roof. Screens are used for the exterior.
  • Exhaust air from the kitchen is released through the roof. A kitchen garbage disposal unit is installed on the roof for deodorization.
  • The corners of the building are shaved in accordance with the findings of simulations and theoretical research.
  • Exterior walls of low solar absorptivity are used. The layout of the building is suitable for the usual wind direction. Water-permeable pavement is used.

Other Features

  • A piping antifriction agent is sealed in the air conditioning piping system to save conveyance power.
  • Perimeter loads are locally treated by adopting simple air flow windows.
  • Hybrid outside air treatment using a combination of a desiccant and a total heat exchanger.
  • In-depth post-operation performance verification was conducted to confirm each energy-saving technology.
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These cases are described based on assessment results obtained using CASBEE.
CASBEE is a method for rating the environmental performance of buildings using Building Environmental Efficiency (BEE) as an indicator, which is based on the results of separate scores obtained for Q-1~Q-3 (Quality) and LR-1~LR-3 (Load Reduction).